When activated by pressing a button, this time delay relay will activate
a load after a specified amount of time. This time is adjustable to
whatever you want simply by changing the value of a resistor and/or
capacitor. The current capacity of the circuit is only limited by what
kind of relay you decide to use.
|
Schematic
|
Parts
Part
|
Total Qty.
|
Description
|
Substitutions
|
C1 | 1 | See Notes |
|
R1 | 1 | See Notes |
|
D1 | 1 | 1N914 Diode |
|
U1 | 1 | 4011 CMOS NAND Gate IC |
|
K1 | 1 | 6V Relay |
|
S1 | 1 | Normally Open Push Button Switch |
|
MISC | 1 | Board, Wire, Socket For U1 |
|
Notes
- To calculate the time delay, use the equation R1 * C1 * 0.85=T,
where R1 is the value of R1 in Ohms, C1 is the value of C1 in uF, and T
is the time delay in seconds.
- S1 may be replaced with an NPN transistor so the circuit can be triggered by a computer, other circuits, etc.
- Most any 6V relay will work for K1. If you use a large relay,
you my need to add a transistor to the output of the circuit in order
to drive the larger load.
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